docs: def clean_text(self, country, guess=False, **kwargs):
          """Determine a two-letter country code based on an input.
  
          The input may be a country code, a country name, etc.
          """
          code = country.lower().strip()
          if code in self.names:
              return code
          country = countrynames.to_code(country, fuzzy=guess)
          if country is not None:
              return country.lower()